package com.hmdp.utils;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;
import java.util.concurrent.TimeUnit;

public class RefreshTokenInterceptor implements HandlerInterceptor {


    private StringRedisTemplate stringRedisTemplate;

    public RefreshTokenInterceptor(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //TODO 1.获取请求头中的token
        String token = request.getHeader("authorization");
        if (StrUtil.isBlank(token)){
            return true;
        }
        //2.TODO 基于token获取redis用户
        Map<Object, Object> usermap = stringRedisTemplate.opsForHash().entries(RedisConstants.LOGIN_USER_KEY + token);
        //3.判断用户是否存在
        if ( usermap.isEmpty()){
            //4.不存在，拦截
            return true;
        }
        //TODO 将查询到的Hash数据转换为UserDTO对象
        UserDTO userDTO = BeanUtil.fillBeanWithMap(usermap, new UserDTO(), false);
        //TODO 刷新token有效期
        //5.存在，保存用户信息到ThreadLocal
        UserHolder.saveUser( userDTO);
        //TODO 刷新token有效期
        stringRedisTemplate.expire(RedisConstants.LOGIN_USER_KEY + token,RedisConstants.CACHE_SHOP_TTL, TimeUnit.MINUTES);
        //6.放行
        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
           UserHolder.removeUser();
    }
}
